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[PWGCF] FemtoUniverse: Add function to pair MCTruth particles #13376

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Merged
prchakra merged 1 commit into from
Oct 14, 2025
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[PWGCF] FemtoUniverse: Add function to pair MCTruth particles #13376

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252 changes: 232 additions & 20 deletions PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackTrackSpherHarMultKtExtended.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@
struct femtoUniversePairTaskTrackTrackSpherHarMultKtExtended {

Service<o2::framework::O2DatabasePDG> pdg;
Service<o2::framework::O2DatabasePDG> pdgMC;
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@vkucera vkucera Oct 14, 2025

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Why are you adding a second identical service member?

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@prchakra prchakra Oct 15, 2025

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Fixed in #13388


/// Particle selection part

Expand Down Expand Up @@ -101,6 +102,9 @@
SliceCache cache;
Preslice<FilteredFemtoFullParticles> perCol = aod::femtouniverseparticle::fdCollisionId;

using FemtoTruthParticles = soa::Join<aod::FDParticles, aod::FDExtParticles, aod::FDMCLabels>;
Preslice<FemtoTruthParticles> perColMCTruth = aod::femtouniverseparticle::fdCollisionId;

/// Particle 1
struct : o2::framework::ConfigurableGroup {
Configurable<int> ConfPDGCodePartOne{"ConfPDGCodePartOne", 211, "Particle 1 - PDG code"};
Expand All @@ -114,6 +118,8 @@
/// Partition for particle 1
Partition<FilteredFemtoFullParticles> partsOne = (aod::femtouniverseparticle::partType == uint8_t(aod::femtouniverseparticle::ParticleType::kTrack)) && aod::femtouniverseparticle::sign == as<int8_t>(trackonefilter.ConfChargePart1) && aod::femtouniverseparticle::pt < trackonefilter.ConfPtHighPart1 && aod::femtouniverseparticle::pt > trackonefilter.ConfPtLowPart1;
Partition<FilteredFemtoRecoParticles> partsOneMC = (aod::femtouniverseparticle::partType == uint8_t(aod::femtouniverseparticle::ParticleType::kTrack)) && aod::femtouniverseparticle::sign == as<int8_t>(trackonefilter.ConfChargePart1) && aod::femtouniverseparticle::pt < trackonefilter.ConfPtHighPart1 && aod::femtouniverseparticle::pt > trackonefilter.ConfPtLowPart1;
Partition<FemtoTruthParticles> partsOneMCTruth = aod::femtouniverseparticle::partType == uint8_t(aod::femtouniverseparticle::ParticleType::kMCTruthTrack);

//

/// Histogramming for particle 1
Expand All @@ -133,6 +139,7 @@
/// Partition for particle 2
Partition<FilteredFemtoFullParticles> partsTwo = (aod::femtouniverseparticle::partType == uint8_t(aod::femtouniverseparticle::ParticleType::kTrack)) && (aod::femtouniverseparticle::sign == as<int8_t>(tracktwofilter.ConfChargePart2)) && aod::femtouniverseparticle::pt < tracktwofilter.ConfPtHighPart2 && aod::femtouniverseparticle::pt > tracktwofilter.ConfPtLowPart2;
Partition<FilteredFemtoRecoParticles> partsTwoMC = aod::femtouniverseparticle::partType == uint8_t(aod::femtouniverseparticle::ParticleType::kTrack) && (aod::femtouniverseparticle::sign == as<int8_t>(tracktwofilter.ConfChargePart2)) && aod::femtouniverseparticle::pt < tracktwofilter.ConfPtHighPart2 && aod::femtouniverseparticle::pt > tracktwofilter.ConfPtLowPart2;
Partition<FemtoTruthParticles> partsTwoMCTruth = aod::femtouniverseparticle::partType == uint8_t(aod::femtouniverseparticle::ParticleType::kMCTruthTrack);

/// Histogramming for particle 2
FemtoUniverseParticleHisto<aod::femtouniverseparticle::ParticleType::kTrack, 2> trackHistoPartTwo;
Expand Down Expand Up @@ -272,34 +279,34 @@

bool IsKaonNSigma(float mom, float nsigmaTPCK, float nsigmaTOFK)
{
if (mom < 0.3) { // 0.0-0.3

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
if (std::abs(nsigmaTPCK) < 3.0) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
return true;
} else {
return false;
}
} else if (mom < 0.45) { // 0.30 - 0.45

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
if (std::abs(nsigmaTPCK) < 2.0) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
return true;
} else {
return false;
}
} else if (mom < 0.55) { // 0.45-0.55

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
if (std::abs(nsigmaTPCK) < 1.0) {
return true;
} else {
return false;
}
} else if (mom < 1.5) { // 0.55-1.5 (now we use TPC and TOF)

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
if ((std::abs(nsigmaTOFK) < 3.0) && (std::abs(nsigmaTPCK) < 3.0)) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
{
return true;
}
} else {
return false;
}
} else if (mom > 1.5) { // 1.5 -

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
if ((std::abs(nsigmaTOFK) < 2.0) && (std::abs(nsigmaTPCK) < 3.0)) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
return true;
} else {
return false;
Expand Down Expand Up @@ -364,7 +371,7 @@
return false;
}
return false;
} else if (particle_number == 2) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
switch (tracktwofilter.ConfPDGCodePartTwo) {
case 2212: // Proton
case -2212: // Antiproton
Expand Down Expand Up @@ -695,6 +702,138 @@
}
PROCESS_SWITCH(femtoUniversePairTaskTrackTrackSpherHarMultKtExtended, processSameEventMC, "Enable processing same event for Monte Carlo", false);

/// This function processes the same event and takes care of all the histogramming
/// \todo the trivial loops over the tracks should be factored out since they will be common to all combinations of T-T, T-V0, V0-V0, ...
/// @tparam PartitionType
/// @tparam PartType
/// @tparam isMC: enables Monte Carlo truth specific histograms
/// @param groupPartsOne partition for the first particle passed by the process function
/// @param groupPartsTwo partition for the second particle passed by the process function
/// @param parts femtoUniverseParticles table (in case of Monte Carlo joined with FemtoUniverseMCLabels)
/// @param magFieldTesla magnetic field of the collision
/// @param multCol multiplicity of the collision
template <bool isMC, typename PartitionType>
void doSameEventMCTruth(PartitionType groupPartsOne, PartitionType groupPartsTwo, int multCol, int ContType, bool fillQA)
{

/// Histogramming same event
if ((ContType == 1 || ContType == 2) && fillQA) {
Comment on lines +719 to +720
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@vkucera vkucera Oct 14, 2025

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What do values 1 and 2 mean? Name them.

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@prchakra prchakra Oct 14, 2025

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Do you mean to add a comment about them?

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@vkucera vkucera Oct 14, 2025

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No. Please read the O2 linter error messages.

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@prchakra prchakra Oct 15, 2025

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Fixed in #13388

for (const auto& part : groupPartsOne) {
if (part.partType() == uint8_t(aod::femtouniverseparticle::ParticleType::kMCTruthTrack)) {
int pdgCode = static_cast<int>(part.tempFitVar());
const auto& pdgParticle = pdgMC->GetParticle(pdgCode);
if (pdgParticle) {
trackHistoPartOne.fillQA<isMC, false>(part);
}
}
}
}

if ((ContType == 1 || ContType == 3) && fillQA) {
for (const auto& part : groupPartsTwo) {
if (part.partType() == uint8_t(aod::femtouniverseparticle::ParticleType::kMCTruthTrack)) {
int pdgCode = static_cast<int>(part.tempFitVar());
const auto& pdgParticle = pdgMC->GetParticle(pdgCode);
if (pdgParticle) {
trackHistoPartTwo.fillQA<isMC, false>(part);
}
}
}
}

if (ContType == 1) {

/// Now build the combinations for non-identical particle pairs
for (const auto& [p1, p2] : combinations(CombinationsFullIndexPolicy(groupPartsOne, groupPartsTwo))) {

int pdgCodePartOne = static_cast<int>(p1.tempFitVar());
const auto& pdgParticleOne = pdgMC->GetParticle(pdgCodePartOne);
int pdgCodePartTwo = static_cast<int>(p2.tempFitVar());
const auto& pdgParticleTwo = pdgMC->GetParticle(pdgCodePartTwo);
if (pdgParticleOne && pdgParticleTwo && (pdgCodePartOne == trackonefilter.ConfPDGCodePartOne) && (pdgCodePartTwo == tracktwofilter.ConfPDGCodePartTwo)) {
float kT = FemtoUniverseMath::getkT(p1, mass1, p2, mass2);
sameEventMultCont.fillMultNumDen(p1, p2, femto_universe_sh_container::EventType::same, 2, multCol, kT, ConfIsIden);
}
}
} else {
for (const auto& [p1, p2] : combinations(CombinationsStrictlyUpperIndexPolicy(groupPartsOne, groupPartsOne))) {

int pdgCodePartOne = static_cast<int>(p1.tempFitVar());
const auto& pdgParticleOne = pdgMC->GetParticle(pdgCodePartOne);
int pdgCodePartTwo = static_cast<int>(p2.tempFitVar());
const auto& pdgParticleTwo = pdgMC->GetParticle(pdgCodePartTwo);

float kT = FemtoUniverseMath::getkT(p1, mass1, p2, mass2);
double rand;
rand = randgen->Rndm();
std::vector<double> f3d;
if (pdgParticleOne && pdgParticleTwo && (pdgCodePartOne == trackonefilter.ConfPDGCodePartOne) && (pdgCodePartTwo == tracktwofilter.ConfPDGCodePartTwo)) {

switch (ContType) {
case 2: {
Comment on lines +772 to +773
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Same

if (rand > 0.5) {
sameEventMultContPP.fillMultNumDen(p1, p2, femto_universe_sh_container::EventType::same, 2, multCol, kT, ConfIsIden);
} else if (rand <= 0.5) {
sameEventMultContPP.fillMultNumDen(p2, p1, femto_universe_sh_container::EventType::same, 2, multCol, kT, ConfIsIden);
}
break;
}

case 3: {
if (rand > 0.5) {
sameEventMultContMM.fillMultNumDen(p1, p2, femto_universe_sh_container::EventType::same, 2, multCol, kT, ConfIsIden);
} else if (rand <= 0.5) {
sameEventMultContMM.fillMultNumDen(p2, p1, femto_universe_sh_container::EventType::same, 2, multCol, kT, ConfIsIden);
}
break;
}
default:
break;
}
}
}
}
}

/// process function for to call doSameEvent with Monte Carlo
/// \param col subscribe to the collision table (Monte Carlo Reconstructed reconstructed)
/// \param parts subscribe to joined table FemtoUniverseParticles and FemtoUniverseMCLables to access Monte Carlo truth
/// \param FemtoUniverseMCParticles subscribe to the Monte Carlo truth table
void processSameEventMCTruth(o2::aod::FdCollision const& col,
FemtoTruthParticles const&)
{
fillCollision(col, ConfIsCent);

auto thegroupPartsOne = partsOneMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, col.globalIndex(), cache);
auto thegroupPartsTwo = partsTwoMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, col.globalIndex(), cache);
bool fillQA = true;
randgen = new TRandom2(0);
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@vkucera vkucera Oct 14, 2025

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randgen is not used

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@prchakra prchakra Oct 14, 2025

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It is used in

O2Physics/PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackTrackSpherHarMultKtExtended.cxx

Line 768 in 4a0e2d7

rand = randgen->Rndm();

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The line you are referring is in another function.

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@prchakra prchakra Oct 15, 2025

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Fixed in #13388


if (ConfIsCent) {
if (cfgProcessPM) {
doSameEventMCTruth<false>(thegroupPartsOne, thegroupPartsTwo, col.multV0M(), 1, fillQA);
}
if (cfgProcessPP) {
doSameEventMCTruth<false>(thegroupPartsOne, thegroupPartsOne, col.multV0M(), 2, fillQA);
}
if (cfgProcessMM) {
doSameEventMCTruth<false>(thegroupPartsTwo, thegroupPartsTwo, col.multV0M(), 3, fillQA);
}
} else {
if (cfgProcessPM) {
doSameEventMCTruth<false>(thegroupPartsOne, thegroupPartsTwo, col.multNtr(), 1, fillQA);
}
if (cfgProcessPP) {
doSameEventMCTruth<false>(thegroupPartsOne, thegroupPartsOne, col.multNtr(), 2, fillQA);
}
if (cfgProcessMM) {
doSameEventMCTruth<false>(thegroupPartsTwo, thegroupPartsTwo, col.multNtr(), 3, fillQA);
}
}
delete randgen;
}
PROCESS_SWITCH(femtoUniversePairTaskTrackTrackSpherHarMultKtExtended, processSameEventMCTruth, "Enable processing same event for MC truth", false);

/// This function processes the mixed event
/// \todo the trivial loops over the collisions and tracks should be factored out since they will be common to all combinations of T-T, T-V0, V0-V0, ...
/// \tparam PartitionType
Expand Down Expand Up @@ -864,26 +1003,6 @@
}
PROCESS_SWITCH(femtoUniversePairTaskTrackTrackSpherHarMultKtExtended, processMixedEventNtr, "Enable processing mixed events for centrality", false);

/// process function for to fill covariance histograms
/// \param col subscribe to the collision table (Data)
/// \param parts subscribe to the femtoUniverseParticleTable
void processCov(soa::Filtered<o2::aod::FdCollisions>::iterator const& /*col*/,
FilteredFemtoFullParticles const& /*parts*/)
{
int JMax = (ConfLMax + 1) * (ConfLMax + 1);
if (cfgProcessMM) {
sameEventMultContMM.fillMultkTCov(femto_universe_sh_container::EventType::same, JMax);
mixedEventMultContMM.fillMultkTCov(femto_universe_sh_container::EventType::mixed, JMax);
} else if (cfgProcessPP) {
sameEventMultContPP.fillMultkTCov(femto_universe_sh_container::EventType::same, JMax);
mixedEventMultContPP.fillMultkTCov(femto_universe_sh_container::EventType::mixed, JMax);
} else if (cfgProcessPM) {
sameEventMultCont.fillMultkTCov(femto_universe_sh_container::EventType::same, JMax);
mixedEventMultCont.fillMultkTCov(femto_universe_sh_container::EventType::mixed, JMax);
}
}
PROCESS_SWITCH(femtoUniversePairTaskTrackTrackSpherHarMultKtExtended, processCov, "Enable processing same event covariance", false);

/// brief process function for to call doMixedEvent with Monte Carlo
/// @param cols subscribe to the collisions table (Monte Carlo Reconstructed reconstructed)
/// @param parts subscribe to joined table FemtoUniverseParticles and FemtoUniverseMCLables to access Monte Carlo truth
Expand Down Expand Up @@ -971,6 +1090,99 @@
delete randgen;
}
PROCESS_SWITCH(femtoUniversePairTaskTrackTrackSpherHarMultKtExtended, processMixedEventMCNtr, "Enable processing mixed events MC", false);

/// This function processes the mixed event
/// \todo the trivial loops over the collisions and tracks should be factored out since they will be common to all combinations of T-T, T-V0, V0-V0, ...
/// \tparam PartitionType
/// \tparam PartType
/// \tparam isMC: enables Monte Carlo truth specific histograms
/// \param groupPartsOne partition for the first particle passed by the process function
/// \param groupPartsTwo partition for the second particle passed by the process function
/// \param parts femtoUniverseParticles table (in case of Monte Carlo joined with FemtoUniverseMCLabels)
/// \param magFieldTesla magnetic field of the collision
/// \param multCol multiplicity of the collision
template <bool isMC, typename PartitionType>
void doMixedEventMCTruth(PartitionType groupPartsOne, PartitionType groupPartsTwo, int multCol, int ContType)
{

for (const auto& [p1, p2] : combinations(CombinationsFullIndexPolicy(groupPartsOne, groupPartsTwo))) {

int pdgCodePartOne = static_cast<int>(p1.tempFitVar());
const auto& pdgParticleOne = pdgMC->GetParticle(pdgCodePartOne);
int pdgCodePartTwo = static_cast<int>(p2.tempFitVar());
const auto& pdgParticleTwo = pdgMC->GetParticle(pdgCodePartTwo);

float kT = FemtoUniverseMath::getkT(p1, mass1, p2, mass2);
double rand;
rand = randgen->Rndm();
if (pdgParticleOne && pdgParticleTwo && (pdgCodePartOne == trackonefilter.ConfPDGCodePartOne) && (pdgCodePartTwo == tracktwofilter.ConfPDGCodePartTwo)) {

switch (ContType) {
case 1: {
if (rand > 0.5) {
mixedEventMultCont.fillMultNumDen(p1, p2, femto_universe_sh_container::EventType::mixed, 2, multCol, kT, ConfIsIden);
} else {
mixedEventMultCont.fillMultNumDen(p2, p1, femto_universe_sh_container::EventType::mixed, 2, multCol, kT, ConfIsIden);
}
break;
}

case 2: {
if (rand > 0.5) {
mixedEventMultContPP.fillMultNumDen(p1, p2, femto_universe_sh_container::EventType::mixed, 2, multCol, kT, ConfIsIden);
} else {
mixedEventMultContPP.fillMultNumDen(p2, p1, femto_universe_sh_container::EventType::mixed, 2, multCol, kT, ConfIsIden);
}
break;
}

case 3: {
if (rand > 0.5) {
mixedEventMultContMM.fillMultNumDen(p1, p2, femto_universe_sh_container::EventType::mixed, 2, multCol, kT, ConfIsIden);
} else {
mixedEventMultContMM.fillMultNumDen(p2, p1, femto_universe_sh_container::EventType::mixed, 2, multCol, kT, ConfIsIden);
}
break;
}
default:
break;
}
}
}
}

/// process function for to call doMixedEvent with Data
/// @param cols subscribe to the collisions table (Data)
/// @param parts subscribe to the femtoUniverseParticleTable
void processMixedEventNtrMCTruth(o2::aod::FdCollisions const& cols,
FemtoTruthParticles const&)
{
randgen = new TRandom2(0);

for (const auto& [collision1, collision2] : soa::selfCombinations(colBinningNtr, ConfNEventsMix, -1, cols, cols)) {

const int multiplicityCol = collision1.multNtr();
MixQaRegistry.fill(HIST("MixingQA/hMECollisionBins"), colBinningNtr.getBin({collision1.posZ(), multiplicityCol}));

if (cfgProcessPM) {
auto groupPartsOne = partsOneMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, collision1.globalIndex(), cache);
auto groupPartsTwo = partsTwoMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, collision2.globalIndex(), cache);
doMixedEventMCTruth<false>(groupPartsOne, groupPartsTwo, multiplicityCol, 1);
}
if (cfgProcessPP) {
auto groupPartsOne = partsOneMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, collision1.globalIndex(), cache);
auto groupPartsTwo = partsOneMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, collision2.globalIndex(), cache);
doMixedEventMCTruth<false>(groupPartsOne, groupPartsTwo, multiplicityCol, 2);
}
if (cfgProcessMM) {
auto groupPartsOne = partsTwoMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, collision1.globalIndex(), cache);
auto groupPartsTwo = partsTwoMCTruth->sliceByCached(aod::femtouniverseparticle::fdCollisionId, collision2.globalIndex(), cache);
doMixedEventMCTruth<false>(groupPartsOne, groupPartsTwo, multiplicityCol, 3);
}
}
delete randgen;
}
PROCESS_SWITCH(femtoUniversePairTaskTrackTrackSpherHarMultKtExtended, processMixedEventNtrMCTruth, "Enable processing MC Truth mixed events for multiplicity", false);
};

WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
Expand Down
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